The Invention of the Columnar Device of Emperor Charles V at the Court of Burgundy in Flanders in 1516.
Journal of the Warburg and Courtauld Institutes, 36:198-230, 1973.
Earl Rosenthal.
[BibTeX] 

Plus ultra, non plus ultra, and the Columnar Device of Emperor Charles V.
Journal of the Warburg and Courtauld Institutes, 34:204-228, 1971.
Earl Rosenthal.
[BibTeX]